Polarimetric imaging can uncover features invisible to human eyes and conventional imaging sensors, and it is becoming an ever more essential technique in modern society. Conventional polarimetric imaging systems require complex optical components and moving parts, making system miniaturization difficult.
, a team of scientists, led by Professor Yu Yao from Arizona State University, School of Electrical, Computer and Energy Engineering, and co-workers have developed chip-integrated metasurface-based Full-Stokes polarimetric imaging sensors for visible wavelengths inspired by the mantis shrimp eye.
They then chip-integrated the MPFA onto the imaging sensor and calibrated the sensor polarization detection with the instrument matrix calibration method. With calibration, they achieved high polarization detection accuracy: Averaged polarization measurement error less than 2% for red and green color .
From the polarization images of objects, they found polarization information carried by these objects are color-dependent, revealing the advantage of dual-wavelength operation. These scientists summarize the operational principle of their polarimetric imaging sensor: "We engineered artificial optical birefringence of Si metasurfaces working similar to a quarter waveplate with dual operation wavelengths range and stack it onto a double layered Al nanogratings with large linear polarization extinction ratio. We also found circularextinction ratio of our chiral metasurface changes slowly to the oblique incidence angle, which is why our sensor can operate at a broad field of view with high detection accuracy.
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